Cucked my ex bf [F]

My ex boyfriend and I were together for over 5 years. I was about 25 at the time and he was around 29. We are attractive and fit. Our sex life has always been very good. We have been occasionally been adventurous. WE have had a number of mfm threeways, we have a once in a while play time with a couple who are good friends and we have had the very occasional dalliance outside the relationship. We tell each other all about those. My ex was straight, but I wouldn’t say I am 100% straight, but have done things with the female half of the couple we play with but it’s more to entertain the guys than any real predilection of mine. The point being that we are not an inexperienced couple.

Last spring we were at a barbecue at a friend’s house. Lot of people. Lot of fun. I was talking to a good friend at one point. We had both had a few drinks. She pointed out the teenage son of another friend. He is 18.

She said, “you would not believe the cock on him”.